LSPR Nanopillar Assembly for Portable PCT Biomarker Detection
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Solution Overview
Problem
Current methods for detecting procalcitonin (PCT) biomarkers in sepsis diagnosis are limited by their bulkiness, high cost, requirement for trained operators, and lengthy processing times, making them unsuitable for timely and portable detection, especially in primary care and rural areas.
Innovation Solution
A localized surface plasmon resonance (LSPR) nanopillar assembly integrated into a fluidic chip, utilizing a polymer spacer and antibody attached to a quantum dot to enhance fluorescence detection, allowing for sensitive and selective PCT detection with a portable and user-friendly system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If chemiluminescent immunoassay (CLIA) or electro-chemiluminescence immunoassay (ECLIA) systems are used for PCT detection, then detection accuracy and reliability are improved, but device size becomes bulky and portability is reduced
Solution Approach 1:
The patent segments the detection system into a miniaturized microfluidic chip containing integrated LSPR sensors and fluidic channels, separating the core detection function from bulky external equipment. This segmentation enables portable PCT detection while maintaining reliability through precise control of assay conditions within the chip.
Solution Approach 2:
The patent replaces the mechanical/optical complexity of CLIA and ECLIA systems with an LSPR-based detection mechanism that uses localized surface plasmon resonance of metal nanoparticles to detect PCT. This substitution eliminates the need for bulky optical components and complex mechanical systems while maintaining detection accuracy.
2Measurement precision
If automated immunoassay systems are used for PCT detection, then detection precision is improved, but operational complexity and requirement for trained operators increases
Solution Approach 1:
The patent implements self-service through the LSPR-based detection system that automatically measures PCT levels without requiring manual intervention for complex operations. The system performs automated signal detection and analysis, eliminating the need for trained operators to perform sophisticated manual procedures while maintaining high measurement precision.
Solution Approach 2:
The patent changes the detection parameter from complex optical/chemical measurements in CLIA/ECLIA to LSPR signal measurement, which can be detected by simpler means. This parameter change simplifies operation while maintaining precision through the sensitivity of LSPR to molecular binding events.
3Reliability
If conventional immunoassay systems are used for PCT detection, then diagnostic accuracy is improved, but processing time increases
Solution Approach 1:
The patent applies preliminary action by pre-functionalizing the LSPR sensors with capture antibodies and preparing the microfluidic channels for sample flow before actual detection. This preliminary preparation enables rapid PCT detection without requiring lengthy setup or incubation periods, maintaining diagnostic accuracy while reducing processing time.
Solution Approach 2:
The patent skips the lengthy incubation and processing steps of conventional immunoassays by using LSPR detection that can measure PCT binding in real-time or near-real-time. The system rushes through the detection process by continuously monitoring LSPR signals as samples flow through the chip, eliminating waiting periods while maintaining accuracy.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The LSPR nanopillar assembly enables rapid and accurate detection of PCT biomarkers, overcoming the limitations of existing technologies by providing a portable, cost-effective, and user-friendly solution for timely diagnosis, capable of detecting low concentrations of PCT with improved sensitivity and selectivity.
Implementation Method 1
LSPR is generated on metal nanostructures upon the illumination of light whose energy can be absorbed by the nanostructures and cause collective electron charge oscillations on its surface
Implementation Method 2
LSPR biosensors have offered rapid detection and are simple-to-operate. LSPR is generated on metal nanostructures upon the illumination of light whose energy can be absorbed by the nanostructures and cause collective electron charge oscillations on its surface
Data Source
AI summary
Disclosed is a localised surface plasmon resonance (LSPR) nanopillar assembly. The LSPR assembly is for use in sensing the presence of a biomarker when attached to a quantum dot. The LSPR assembly comprises a substrate and an array. The array comprises a LSPR nanopillar and a polymer spacer attached to the nanopillar. The LSPR assembly further comprises an antibody attached to the at least one polymer spacer. In the LSPR assembly, a combined height of the polymer spacer and antibody is selected by varying the number of monomer units of the polymer spacer, so that, when in use with the biomarker and the quantum dot, the quantum dot is at a predetermined distance from the nanopillar.